Countersink



(No Model.)

B. P. BARBER. Oountersink.

UNITED STATES PATENT OFFICE.

D. FLETCHER BARBER, OF NEWTON, MASSACHUSETTS.

COUNTERSINK.

SPECIFIGATIQN forming part of Letters Patent No. 230,603, dated August3, 1880.

Application filed April 26, 1880.

To all whom it may concern Be it known that I, D. FLETCHER BARBER, ofNewton, inthe county of Middlesex and State of Massachusetts, haveinvented an Improved Gountersink, of which the followingis a full,clear, concise, and exact description, reference being had to theacoompanyin g drawings, making a part hereof.

In the drawings, Figure l is a side elevation of my improvedcountersink. Fig. 2 is the same with the cutter reversed to adapt thetool for use for pointing dowel-pins. Fig. 3 is a plan of the blank fromwhich my new cutter is formed. Fig. 4 is a section.

My cutter A is hollow, conical in form, and made of sheet-steel from theblank shown in Fig.3, and has two cutting-edges one, a, projecting alittle beyond the exterior surface, the or her, a, a little beyond theinterior surfacethe space left between these cutting-edges forming anescape-aperture for the shavings. This cutter is mounted upon a stock,B, so that it can be reversed, as clearly shown in the drawings, andthereby adapted for two usesone as a countersink and the other forforming a conical end on a dowel-pin, or the like.

0 is the catch by which the cutter A is held in the desired position.This catch is a bent piece of spring-wire, which passes through a holein stock B, so that the bent ends of it will engage with the holes inthe ears on each side of the cutter. The other pair of cars areconnected by rivets to the forked end of the stock B.

D is a clamp composed of two strips of sheetmetal hinged together neartheir middle, and

(No model.)

having a set-screw passing through one end of one of them, by which theother ends of the two strips are made to act as a clamp in thewell-known manner. A small roll, I), is secured upon a stud fast to theouter member of the clamp. This clamp is applied to the countersink, asshown in the drawings, and held in place by tightening the set-screw.The roll 1) comes in contact with the wood when the countersink is ofthe proper depth. This adj Listing-roll clamped to the countersink andadjustable thereon also forms a part of my invention.

countersink.

What I claim as my invention is- 1. In combination, cutter A, made inthe form of a hollow cone not truncated and having two cutting-edges, aa--one internal, the other external'stock B, and catch 0, whereby thecutter can be reversed in its stock, as and for the purpose specified.

2. In combination with countersink-cutter A, clamp D, composed of twostrips of metal hinged together, having a set-screw at one end and rollI) at the other end, as and for the purpose specified.

3. The countersink-cutter A, made in the form of a hollow cone nottruncated, with an opening from its apex to its base, and provided withtwo or more rivet-holes near its base. by which to attach it to a forkedstock, as described.

D. FLETGHER BARBER. Witnesses:

J. E. MAYNADIER, WM. ZITTEL.

It can be used with the ordinary

